Plaguemaw Beast is a uncommon Creature — Phyrexian Beast card from Mirrodin Besieged (MBS), collector number 87. Current market price: $0.29 (foil $0.50), TCGplayer market prices via Scryfall.
{T}, Sacrifice a creature: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)